Any help with blending the gap between materials on seperate UVs?

I was wondering if anyone could help me with smoothing the gap between two materials on a subdivided yet still connected plane, the UV’s are overlapping however that isn’t an issue to my knowledge. Is there anything I could do to make the transition from the pathway to grass a lot smoother, especially on corners?

Also, bonus question does anyone know of a way to overlap another texture on top of the existing material with a lower opacity (around 40%) and an alpha attached?

Very new to UE4, obviously, so ANY help is great :slight_smile: